JPH0698347B2 - Levitation separation cyclone device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a levitation separation cyclone device for levitation separation of dissolved substances, suspending substances, sedimenting substances, etc. in wastewater.

<Prior art> Conventionally, there are various methods such as filtration, coagulation, precipitation, electrolysis, and pressure levitation as methods for separating and removing dissolved substances, suspending substances, and sedimenting substances in wastewater. There are many problems in terms of physical, economic, processing capacity, or locational conditions.

As a countermeasure against this, the present inventor previously mixed waste water or pretreated waste water with a large amount of low-pressure air and a chemical agent in the presence of a foamy substance such as a surfactant, and agitated the resulting adhesiveness. Low-pressure flotation separation method in which various flocs and suspended substances in wastewater are captured by rich foam, and special agents are added to this to float and separate as a strong foam scum (Japanese Patent Application No. 54-2781).
Proposed.

Furthermore, the present inventor has developed this low-pressure flotation separation method to dramatically improve the processing capacity in the flotation separation step, eliminate the need for a mechanical dehydration step accompanying the improvement of the dehydration property of the separation scum, and reduce the size of the apparatus. In order to reduce the cost, reduce the installation area, and reduce the installation area, Japanese Patent Application No. 57-127235 proposes a purification device using a floating separation cyclone device.

(A) First, a condition-imparting chemical is injected into the raw water in the raw water tank and stirred by a stirring device to precipitate a heavy metal compound, or the emulsion is broken to produce flocs.

(B) After doing this, as shown in FIG. 5, low-pressure air is injected by the air pump 4 in the flow path 3 to the cyclone body 2 of the floating separation cyclone device 1 in the raw water, and the pump 5 Fine bubbles (foam) are generated in the flow path 3 reaching the cyclone main body 2 by mixing and stirring, and a large amount of strong foam scum that is hard to break and has flocs adhered around the foam is formed. In addition, immediately before or immediately after the pump 5, the flotation separation type chemical is injected to promote the generation of the foam scum.

(C) Then, the raw water with a large amount of foam scum thus formed is attached to the outer periphery of the cyclone body 2 of the floating separation cyclone device 1 shown in FIG.
And the tip portion 6a of the spiral tube 6 penetrating into the cyclone body 2 is fed in a circumferential direction at a low speed such that bubbles are not broken. Raw water in a state where a large amount of foam scum A is generated circulates in the cyclone body 2 in a circular motion.

(D) Due to the centrifugal separation action in this circular motion, the liquid has a large specific gravity, so the liquid scatters radially outward, and the foam scum A gathers at the center because it has a small specific gravity. The lumps of foam scum A float to the top.

Then, the foam scum A is pushed up sequentially by the buoyancy of the foam scum A that is subsequently sent, and becomes a state in which it is projected above the liquid surface, so that natural dehydration progresses and the water content gradually increases. It becomes a low foam scum. And
By the foam scum that is further pushed up above the liquid surface after that, the foam scum in the front is further opened in the opening portion of the cylindrical body 2.
It is pushed upward from the upper end of 2a one by one, so that the liquid adhering to the foam scum flows down and becomes a foam scum with a lower water content and is gradually consolidated.

Then, the foam scum pushed upward from the opening 2a is opened by the skimmer (scraping machine).
It is scraped off by a chute 7 on the outer circumference of the scoop, and is discharged from the chute 7 to a scum dewatering device (not shown), and the liquid is further separated and dewatered by the scum dewatering device. In this way the substances to be removed in the raw water are eliminated.

From the lower part of the cyclone main body 2 of the levitation separation cyclone device 1, the liquid separated from the foam scum and purified is discharged as it is as shown by an arrow B, or is sent to the second levitation separation cyclone to generate foam. After further purification by separation from scum, it is discharged.

<Problems to be Solved by the Present Invention> As described above, when the floating separation cyclone apparatus 1 of Japanese Patent Application No. 57-127235 is used, rapid mass treatment of wastewater is realized, but there are the following problems. .

(A) In the levitation separation cyclone device 1, foam scum is generated in raw water and introduced into the cyclone main body 2 of the levitation separation cyclone device 1, but if the raw water is extremely dirty, the foam generation force is weak ( This is because if the pollutants in the raw water are large and heavy, even if they adhere to the foam, the foam will be broken immediately.)

Therefore, the more dirty the raw water is, the less the amount of foam scum is generated. Therefore, the contaminants are not sufficiently separated, and the purification efficiency is poor. For this reason, in the case of heavily contaminated raw water, the floating separation cyclone device 1 had to be provided in several stages or more.

(B) In the spiral pipe 6, the pollutants in the raw water adhere to the foam to form foam scum, which is introduced into the cyclone main body 2. In the cyclone main body 2, the foam is discharged from the tip 6a of the spiral pipe 6. As it rises to the top as it is,
The contaminants that did not adhere to the foam in the spiral pipe 6 settled as they were in the cyclone body 2 without encountering the foam, so the purification efficiency was poor.

(C) In the raw water, there are many cases where metal is masked by various chemicals and oil is emulsified. Therefore, in these treatments, pH adjustment, various breakers, coagulants, adsorption aids and other reagents are used as pretreatment. Therefore, since these reagents remain in the liquid purified by the flotation / separation cyclone device 1, it may be inappropriate to discard the purified liquid as it is.

(D) If the raw water is extremely dirty even if it is purified by this levitation separation cyclone device, a substance or BOD that emits an odor
Since many sources and COD sources may be dissolved, it was inconvenient to directly discard them. Therefore, conventionally, it is necessary to further provide an aeration device or a biological treatment device for processing, the entire purification device becomes large, and an installation area for these devices is required.

The present invention solves such a problem, the purification efficiency is remarkably improved only by adding a simple means, the residual reagent in the purified liquid is reduced, and the aeration device and the biological treatment device are further improved. An object is to provide a floating separation cyclone device that is unnecessary.

<Means for Solving the Problems> In order to solve the problems, in the levitation separation cyclone device of the present invention, a part of the liquid in which the foam scum is separated is taken out from the lower part of the cyclone main body, and the liquid is gas. It is characterized in that it is mixed and stirred so as to be refluxed in the cyclone body.

<Action> Because of this, from the bottom of the cyclone body,
A part of the liquid separated from the foam scum and purified is taken out. Even if the raw water introduced at the beginning is heavily contaminated, the purified liquid has less contamination than the state initially introduced into the cyclone body, and therefore a large amount of foam is generated when the gas is mixed and stirred. The liquid in which a large amount of this foam is generated is circulated in the cyclone body.

The large amount of foam in the refluxed liquid serves to push up the foam scum, which is initially introduced into the cyclone body in the circumferential direction, upward in the cyclone body by buoyancy.
Not only that, the fine contaminants that float or settle down without adhering to the initially introduced foam adhere to the large amount of foam in the refluxed liquid,
Newly, a large amount of foam scum circulates in the circumferential direction, gathers in the center, and rises as a mass of foam scum.

Therefore, even if the amount of foam scum generated in the cyclone main body in the circumferential direction is severely contaminated and a small amount of foam scum is generated, a portion of the purified water is taken out from the bottom of the cyclone main body, and the gas is mixed and stirred. Since it continues to recirculate as a liquid containing a large amount of foam, the contaminants remaining in the purified water without getting the opportunity to adhere to the foam introduced first will be sequentially adhered to the foam and removed. , The purification efficiency is dramatically improved.

Moreover, the foam produced by the reflux liquid becomes a strong foam scum in combination with the reagent remaining in the liquid, and the purified water discarded from the cyclone body is generally purified.

Also, in the liquid recirculation from the lower part of the cyclone body, it is vigorously stirred and mixed with the injected air, a large amount of bubbles consisting of fine particles of bubbles are generated, and the treated water and the air are sufficiently contacted, so the purified water The aeration effect of is also sufficiently performed.

<Examples of the Present Invention> Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a floating separation cyclone device 10 of the present invention.

The pipe 13 in the flow path that reaches the cyclone body 12 is provided with a spiral pipe 16 while stirring the liquid, and the cyclone body 12
A low pressure pump 14 is provided on the side for pumping at a low speed such that the foam scum is not destroyed.

An air pump 15 for feeding low-pressure air is provided immediately before the pump 14 in the pipe 13 of the flow path. Further, a liquid agent for promoting foam generation is injected into the pipe 13 immediately before or after the pump 14.

For this reason, the liquid is vigorously stirred by the pump 14 together with the air to generate bubbles (fine bubbles) in the pipe 13, and while being fed in the spiral pipe 16, contaminants are attached to the bubbles to cause foam scum. To generate.

A spiral pipe 16 is wound around the outer periphery of the cyclone body 12, and the tip portion 16a of the spiral pipe 16 is attached to the cyclone body 1.
It is penetrated so that the liquid and the foam scum A are introduced into 2 in the circumferential direction.

The length of this spiral pipe 16 is agitated with the air by the pump 14 and sent out, and the tip portion of this spiral pipe 16 is
By 16a, the length is set to be long enough to sufficiently separate the foam scum and the liquid.

At the lower part of the cyclone body 12, a circulation pipe 17 is provided, which takes out a part of the liquid in the cyclone body 12 and circulates it back into the cyclone body 12.

In the circulation pipe 17, while stirring the liquid, the cyclone body 12
There is a pump 18 for delivering the
The liquid in the cyclone body 12 is sequentially circulated by the circulation pipe 17
It is sucked in and recirculates into the cyclone body 12 again.
Immediately before the pump 18, the gas from the air pump 15 is injected into the circulation pipe 17 and mixed and stirred by the pump 18, so that a large amount of foam is generated.

The tip portion 17a of the circulation pipe 17 is arranged below the tip portion 16a of the spiral pipe 16 and above the communication pipe 26 so that a liquid containing a large amount of foam is circumferentially introduced into the cyclone body 12. Has been penetrated. In addition, 19a is a flow control valve and 19b is a solenoid valve.

A chute 20 is attached to the upper portion of the cyclone body 12 for receiving the foam scum A overflowed or scraped off from the opening 12a and dropping it.

A horizontal plate 21 is diametrically attached to the upper end of the cylindrical portion 20a in the upper part of the chute 20, and a skimmer 22 that is rotated by a motor (not shown) is rotatably attached to the lower central side of the horizontal plate 21. Has been. The skimmer 22 is for scraping off the foam scum A, which has been rotated and pushed upward from the opening 12a of the cyclone body 12, onto the chute 20.

A cylinder 25 having an opened upper surface for adjusting the liquid level is provided alongside the cyclone body 12. Cyclone body 12 and cylinder
The lower pipe 25 communicates with the lower communication pipe 26.

A drain pipe 27 is provided on the upper portion of the tubular body 25. That is,
The upper end portion 27a of the drainage pipe 27 is formed by
It penetrates inside and is located in the upper part of the cylinder 25.

An outer cylinder 28 is attached to the inside of the upper end of the cylindrical body 25 so as to be vertically movable, and is fixed to the cylindrical body 25 with its height adjusted by a fastener 28a. An inner cylinder 29 is mounted in close contact with the outer peripheral portion of the upper end portion 27a of the drainage pipe 27 and is vertically movable. The outer cylinder 28 and the inner cylinder 29 are integrally connected. The liquid in the cylindrical body 25 flows into the drain pipe 27 from the upper end portion 29a of the inner cylinder 29 and is discharged to the outside. Therefore, when the height of the outer cylinder 28 is adjusted and fixed to the cylinder 25, the heights of the liquid surface of the liquid in the cylinder 25 and the liquid surface of the liquid in the cyclone body 12 are determined by the upper end 29a of the inner cylinder 29. Adjusted to the position. Therefore, the liquid level is adjusted so that it is slightly below the opening 12a at the upper end of the cyclone body 12, and the height of the inner cylinder 29 is adjusted according to the amount of the foam scum floating at the upper end opening of the cyclone body 12. To do.

Because of this structure, raw water mixed with chemicals
While being agitated and mixed with air by the pump 14 to generate a large amount of foam, while the spiral pipe 16 is slowly fed from the inside of the pipe 13 at a low pressure, a scum is attached to the foam to form a foam scum, which is a liquid. To separate.

And, in this separated state, the tip of the spiral pipe 16
The foam scum A and the liquid are introduced from 16a into the cyclone body 12 in the circumferential direction, and circulate in the cyclone body 12 in a circular motion.

Due to the centrifugal action in this circular motion, the liquid has a large specific gravity and is radially outward, and the foam scum A has a small specific gravity, and thus gathers in the center, and the foam scum A aggregates and adheres to each other to form a mass (aggregate). Due to the buoyancy, the lump of foam scum A floats to the upper part.

Then, the foam scum A is successively pushed upward by the buoyancy of the foam scum A that is subsequently sent and is projected above the liquid surface, whereby natural dehydration proceeds and is gradually consolidated. In this way, in the cyclone body 12, the foam scum A gathers in the upper part and the lower part is in a liquid-only state.

A low-pressure gas is injected from the air pump 15 into the liquid in the circulation pipe 17, mixed and stirred with the gas by the pump 18, and sent out at a low pressure. Therefore, a part of the liquid in the lower part of the cyclone main body 12 is sequentially introduced into the circulation pipe 17 and pumped.
It is returned to the inside of the cyclone body 12 again by 18.

The liquid underneath the cyclone body 12 is less contaminated than when it was initially introduced into the cyclone body 12 from the spiral pipe 16, and since there is also residual reagent in the liquid, a larger amount of Generates foam. The liquid in which a large amount of foam is generated in this way is
Below the tip portion 16a, the fluid is circulated in the cyclone body 12 from the tip portion 17a of the circulation pipe 17 in the circumferential direction.

The liquid containing a large amount of foam circulated in this manner circulates in the circumferential direction in the cyclone body 12, but the large quantity of foam pushes up the foam scum A in the cyclone body 12 by buoyancy, Particles of the pollutant that initially float or settle down without getting a chance to adhere to the foam introduced into the cyclone body 12 adhere to the large quantity of foam introduced from the circulation pipe 17, The scum A becomes a scum A, and these foam scum A gradually gather in the center while being migrating and collectively adhere to each other to rise as a mass of a large foam scum. The circulation by the circulation pipe 17 is continuously performed.

The liquid in the cyclone body 12 separated from the foam scum in this way passes through the communication pipe 26 and the inner cylinder 29 above the cylindrical body 25.
It flows into the drain pipe 27 from the upper end portion 29a and is discharged to the outside.

FIG. 2 exemplifies an example of the system of the entire purifying device using the floating separation cyclone device 10 of the present invention described above.

In FIG. 2, 30 is a first raw water storage tank for storing wastewater to be purified, 31 is a pump, 32 is a stirrer, 33 is an overflow device for collecting oil and the like separated naturally from wastewater, 34
A and 34b are partition plates.

Reference numeral 40 denotes a second raw water storage tank for storing the waste water sent from the first raw water storage tank by the pump 31 and the optional water sent from the scum dewatering device 90. 41 is a pump for sending raw water in the raw water tank to the condition giving tank 50, 42 is a pipe, 43 is water level detection for detecting the water level of the raw water in the raw water tank 1 and sending a signal for starting and stopping the pump 41 The vessel and 44 are stirring devices.

50 is a condition giving tank, and is divided into three tanks, a first tank 53, a second tank 54, and a third tank 55 by partition plates 51a, 51b and 52a, 52b, and each tank is a partition plate 51a, 51b. And 52a, 52b are connected by an open circuit.

The first tank 53 is provided with an overflow device 56 that returns the raw water to the raw water tank 40 when the water level exceeds the set water level height. Five
Reference numerals 8 and 59 are stirrers, 60 and 61 are pH meters, and 62 is a pump for delivering the liquid from the third tank 55.

Reference numeral 63 is a cylindrical tubular body which is attached to the wall portion of the tank 50 or the partition plate 52a by the mounting arm 64 so as to surround the stirring devices 58 and 59 and which is open at the top and bottom.

Without this cylinder 63, even if the liquid in the tank 50 is stirred by the stirring devices 58, 59, the liquid around the stirring devices 58, 59 is only stirred, and for example, the specific gravity floated above the liquid surface. Small oils, etc. stay in the upper part and are not stirred. But,
When the cylindrical body 63 is provided, the propellers 58a and 59a of the stirring devices 58 and 59 are provided.
As a result, the liquid flows downward from the lower opening of the cylinder 63, and convection occurs in which the upper liquid flows from the upper opening of the cylinder 63. Therefore, if this cylinder 63 is provided,
The entire liquid in the second tank 54 and the third tank 55 is evenly stirred.

Reference numeral 70 denotes a condition-imparting type drug supply device, for example, a drug tank 71 in which a drug for destroying the emulsion in the emulsion oil-containing wastewater (this is referred to as X agent) is stored, and a decomposed free oil is adsorbed and collected. A drug tank 72 in which a drug (this is referred to as an OH agent) is stored is provided. The X agent is injected into the second tank 54 by the pump 73, and the OH agent is injected into the third tank 55 by the pump 74. . 75 and 76 are stirring devices.

80 is a flotation type chemical supply device, which is a chemical for scumming various flocs in the condition application tank 50 (ZK agent, ZA
It is described as an agent. ) Each containing ZK agent tank 81 and ZA agent tank 82, and the ZK agent in the ZK agent tank 81 is supplied to the pipe 13 by a pump 83.
Just before the suction of the pump 14, the ZA agent in the ZA agent tank 82 is injected by the pump 84 immediately before the discharge of the pump 14. 85,
86 is a stirrer.

The chemical is selected depending on the type of raw water to be treated. For example, when the raw water is emulsion oil-containing wastewater (mechanical factory wastewater), the X agent is ferric chloride, the OH agent is caustic soda, and the ZK agent is Cationic polymer flocculants and ZA agents are anionic polymer flocculants.

90 is a scum dewatering device for dewatering foamy scum discharged from the chute 20 of the floating separation cyclone device 10, 91
Is a pipe for returning the liquid discharged from the scum dehydrator 90 to the second raw water storage tank 40.

Reference numeral 100 is a pipe for returning the underflow of the tubular body 25 of the floating separation cyclone device 10 to the second raw water storage tank 40, and 101 is a flow control valve.

Next, the operation of the entire system shown in FIG. 2 will be described by taking the treatment of emulsion oil-containing wastewater as an example.

First, the raw water in the raw water tank 40 is supplied to the condition giving tank 50 by the pump 41.
Is sent to the first tank 53.

The raw water stored in the first tank 53 flows into the second tank 54 from the communication passage formed by the partition plate 51, the X agent is injected from the medicine tank 71, and is stirred by the stirring device 58. This X agent destroys the emulsion in the raw water. The destroyed emulsion oil-containing wastewater is transferred from the communication passage composed of the partition plates 52a and 52b to the third tank.
The oil and the like flowing into 55, where the OH agent is injected from the chemical tank 72 and stirred by the stirring device 59 and decomposed and released, are adsorbed by the colloidal flocs generated from the X agent and the OH agent.

The condition-provided raw water that has been subjected to the above-mentioned treatment is sent by the pump 62 through the pipe 13 to the levitation separation cyclone device 10.

In the levitation separation cyclone device 10, as described above, the pump
Since low-pressure air is injected from the air pump 15 immediately before 14, the air is decomposed and agitated by the pump 14, and a large amount of fine bubbles are generated in the liquid.

Along with this, in order to promote scumming, the ZK agent is injected into the suction side of the pump 14 from the chemical tank 81 and the ZA agent is injected into the discharge side from the chemical tank 82, so that flocs are formed in the fine bubbles. By adhering, by this, scum with a special composition that is easy to float and hard to break is generated, and the generated foam scum is destroyed from the tip 16a of the spiral pipe 16 to the cyclone main body 12 while being sent spirally. It is introduced in the circumferential direction at a low speed that is not possible.

In the cyclone body 12, as described above, the circulation pipe 17
Combined with the function of regenerating foam by the, the mass of foam scum is generated more efficiently, and the mass of foam scum is pushed upward to the opening 12a at the top of the cyclone body 12, as described above. The foam scum, which is maintained in a state of being lifted above the liquid surface and pushed upward from the opening 12a, is naturally dehydrated and consolidated, and becomes in a very good dehydrating state.

Foam scum that has been dehydrated and consolidated in this way is a skimmer
22 is scraped from the opening 12a in the outer peripheral direction by the drop 22, drops on the chute 20, is further dehydrated while staying there, and then drops on the scum dehydrator 90, and is further mechanically pressed and dehydrated. . The filtered water of the scum dewatering device 90 is returned to the first raw water storage tank 40 by the pipe 91.

The liquid thus separated and purified from the foam scum is discharged to the outside from the drain pipe 27 of the cylindrical body 25 of the flotation / separation cyclone device 10.

Fig. 3 shows that the raw water used here is waste water from a mechanical polishing factory.
The degree of dirt varies from day to day.

FIG. 5 shows the measurement results of COD and BOD of the liquid discharged after purification, when the conventional apparatus shown in FIG. 5 and the apparatus of the present invention shown in FIG. 1 were used.

In FIG. 3, the horizontal axis represents the date. (A) in the figure
The period of (1) is the result of measurement by the conventional device of FIG. 5, and the period of (b) is the result of measurement by the purification device using the device of the present invention to which the circulation pipe of FIG. From this figure, according to the device of the present invention, COD, B
It can be seen that the OD value is low and cheap.

That is, during the period (a), COD, B
There are large variations in the OD value. This means that when the raw water is heavily contaminated, the purification efficiency deteriorates in the conventional apparatus shown in FIG.

On the other hand, in the period of (b), this variation is extremely small, which shows that the apparatus of the present invention does not deteriorate the purification efficiency even if the raw water is heavily contaminated.

Table 1 shows the results of the purification process for raw water (general wastewater of a mechanical cutting factory) different from that shown in FIG.

Is. The removal rate indicates the percentage of BOD and COD removed from the treated water of A. As described above, in the present invention, it is understood that the purification efficiency is remarkably improved by taking out a part of the purified water by the circulation pipe and circulating it while generating bubbles.

FIG. 4 shows that in order to purify raw water with a higher degree of pollution, two flotation separation cyclone devices 10 are provided, and a second condition giving tank 110 is provided between the two flotation separation cyclone devices, and if necessary, conditions are set. Three drug layers of the imparting system drug supply device 70 and the floating separation system drug supply device 80, 77 to 79 and 87 to 89, respectively.
The example which provided each is shown.

<Effects of the Present Invention> In the flotation separation cyclone device of the present invention, as described above, part of the purified water of the cyclone body 12 is supplied to the circulation pipe 17
It was taken out from the tank and was mixed again with air to generate bubbles and return it to the cyclone body 12 again, so (a) the raw water was heavily contaminated, and the spiral pipe 16 that was first introduced into the cyclone body 12 Even if the amount of liquid foam scum generated in is small, since a portion of the purified water in the cyclone body 12 is taken out into the circulation pipe 17 and mixed with air,
Even if the raw water is extremely dirty, a large amount of foam is generated, and contaminants in the liquid adhere to the large amount of foam from the circulation pipe 17 to generate foam scum. Does not deteriorate.

(B) In this way, a large amount of foam introduced from the circulation pipe 17 is attached with pollutants that are introduced into the cyclone body 12 and are suspended or settled in the liquid without adhering to the foam in the spiral pipe 16. Then, it becomes a foam scum and rises, so that the purification efficiency is dramatically improved.

(C) Since the foam scum is pushed up from the spiral pipe 16 by the floating force of a large amount of foam scum generated from the circulation pipe 17 from below, the pushing force of the foam scum onto the liquid surface of the upper end opening of the cyclone body 12 is increased. It becomes stronger, the dewatering and compacting action of the foam scum is promoted, and the effect of floating separation is dramatically improved.

(D) The reagent remaining in the liquid in the cyclone body 12 adheres to a large amount of foam from the circulation pipe 17 and floats and separates as a foam scum, so that the reagent in the liquid discarded from the cyclone body 12 The remaining amount is significantly reduced.

(E) In the recirculation of the liquid from the lower part of the cyclone body, the liquid once treated is further vigorously stirred and mixed with the air, and a large amount of bubbles consisting of fine particles of bubbles are generated, and the treated water and the air are mixed. Since the contact between the two is performed continuously, the aeration action is strongly performed, and it is not necessary to provide a special aeration device or biological treatment device as in the conventional case. The installation space can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a flotation separation cyclone device of the present invention, and FIGS. 2 and 4 are overall configuration diagrams of a purification device system using the flotation separation cyclone device of the present invention. FIG. 3 is a graph showing an example of actual measurement of the conventional device shown in FIG. 5 and the device of the present invention shown in FIG. FIG. 5 is a schematic configuration diagram showing a conventional floating separation cyclone device. 10 …… Floating separation cyclone device, 12 …… Cyclone body, 12a …… Opening part, 13 …… Pipe, 14 …… Pump, 15
...... Air pump, 16 ...... Spiral pipe, 17 ...... Circulation pipe, 18 ...... Pump, 20 ...... Chute, 22 …… Skimmer, 25 …… Cylindrical body, 26 …… Communication pipe, 27 …… Drainage pipe, 30 ……
1st raw water storage tank, 40 ... 2nd raw water storage tank, 60 ... Condition application tank, 70 ... Condition application system chemical supply device, 80 ... Flotation separation system chemical supply device, 90 ... Scum dewatering device.

Claims (1)

[Claims] 1. A cyclone main body having an opening formed on an upper surface thereof, wherein condition-imparting raw water in which foam scum is generated is introduced into the cyclone main body in a circumferential direction so as to be circulated in a circular motion to obtain a specific gravity. Due to the difference, the liquid is gathered outward in the radial direction and the foam scum is gathered in the central part to generate a mass of the foam scum that has collected and adhered to each other, and is levitated. In a levitation separation cyclone device that sequentially pushes up a mass of floating foam scum to above the liquid surface and discharges it outward from the upper end of the opening, and discharges the liquid separated by the foam scum inside the cyclone body to the outside. A part of the liquid separated by the foam scum is taken out from the lower part of the cyclone body, and the gas is mixed and stirred with the liquid to be refluxed in the cyclone body. Levitation separation cyclone device.